bi-fold doors
Front, Back and Patio Doors

Bifolding Doors Sussex

Bifolding Doors – Add The Wow Factor To Your Home

Imagine being able to open up an entire wall of your room, creating space and letting fresh air and natural daylight flood into your home. Coastline Windows supplies and install sliding doors throughout East and West Sussex.

Whether you have a bedroom with a Juliette balcony, a dining kitchen, a conservatory or an orangery, bi-folding doors can provide a stunning alternative to patio or French doors. We also offer a range of home improvements.

Coastline’s bi-folding doors were the first fully bespoke PVCu bi-folds to be designed, engineered and made in the UK – and we believe they are still the best - they are designed and manufactured by Liniar.

Available in a wide choice of opening configurations and colours, your bi-fold has ultra-slim sightlines, providing your room with a clean, modern appearance. We also offer aluminium windows and doors if you would prefer this material.

Safety features include the innovative low threshold option for family-friendly and wheelchair use.

What’s more, the Liniar bi-fold doors are high quality and offers high energy efficiency, combined with the best security features on the market – bringing you a modern space-saving solution for your home that will definitely give it the wow factor.

Coastline Windows supply and fit high-performance bifolding doors across the surrounding areas in Eastbourne and Sussex. We prioritise excellent customer service within all of our work, from start to finish.

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Better for the environment

Energy Efficiency Explained

One of the most effective ways you can save energy within your home is by installing energy-efficient windows, doors and roofs.

Liniar frames outperform most of the other leading brands in the UK when it comes to thermal efficiency – mainly due to our innovative PVCu multi-chambered profile design.

The thermal efficiency of a door is measured in U-values, which demonstrate how effective the door is at preventing the transfer of heat into and out of a building.


Liniar profile is made from 100% lead-free PVCu – better for the environment and better for you and your family. You no longer have lead in your petrol or paint, so why choose to have frames containing lead?

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100% Quality
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Designed for today’s challenges

The Liniar bi-folding door range is beautifully designed for modern living.

Built to create the perfect summer ambience, it’s equally as important that our doors withstand the worst of the British winter weather.

We’ve rigorously tested our bi-folding doors to make sure they exceed the appropriate British Standards for weather performance.

We also subject our doors to a regime of robot cyclic testing in our purpose-built laboratory, making sure all mechanical parts will stand up to the repeated operation necessary for daily living.

grey bi-folding doors

A Grand Design

Bi-folding doors are becoming more popular than ever before, thanks in part to their regular appearance in television home make-over and lifestyle programmes.

Timber or Aluminium bi-fold doors are often perceived as the only materials that can be used for bi-folding doors, but doors made from lead-free PVCu can actually offer many more benefits:

  • Smoother operation
  • Higher thermal efficiency
  • Lower maintenance
  • Can perfectly match your other doors and windows


Your Home, Your Choice

The Liniar range offers complete flexibility, whatever the room or the size of the opening you need.

Manufactured in our decorative sculptured profile, Liniar bi-folding doors are available in a wide variety of colours.

With options from two to seven panes, all with our beautiful, super-slim sightlines, you can also choose how many doors fold back to each side of the frame.

The Liniar standard bi-fold door range is available in a wide range of configurations whilst the Liniar ModLok™ bi-folding door range offers an even greater number, due to its additional strength and rigidity.

A brand new concept in locking technology, ModLok™ has been developed by Liniar to enable even wider door configurations.

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Designed for living

Liniar’s bi-folding door systems are crammed full of innovative design features.

Low Maintenance

With a set of Liniar bi-folding doors, you can rest assured that you won’t need to spend hours looking after them to maintain their beauty.

Our 10-year frame guarantee gives you the peace of mind that the colours won’t fade – and not only that, you won’t need to treat or paint them each year to keep them in tip-top condition.

Just an occasional wipe down with soapy water is all they need to keep them looking their best.

Family Friendly

The Registered Design protected Liniar low-threshold option creates a seamless entrance and exit, making it ideal for family homes. An optional tray to seat the low threshold creates an easy-access ramp for wheelchairs and prams.

Ultra-low, the Liniar threshold measures just 24mm at its highest point, with a silver or gold finish available to perfectly complement the door hardware.

Strong and Secure

The shoot bolt locking mechanism designed into each Liniar bi-folding door ensures the door is bolted firmly into the stainless steel track, maximising your security. Built-in anti-lift features, anti-bump cylinders and optional anti-snap cylinders combine to bring you peace of mind.


We’ve added slim hinges with the fixings hidden inside, not only maintaining the sleek lines but enhancing security as they can’t be unscrewed from outside.

We wanted to offer a low threshold, without the need for expensive and messy excavation, so we designed our own clever solution.

We’ve even designed folding keys, to avoid any problems with keys being left in the locks during operation – it’s often the small things that make a huge difference.

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Uniquely Designed

We’ve taken steps to protect our designs to ensure only our customers get all the benefits that come with choosing Liniar:

Super Smooth Action

Your bi-folding doors are engineered to give you the reassurance that they won’t bend or warp, whilst the super smooth rolling action makes them feel incredibly light.

Ergonomic handles are built into each hinged section, making the doors easy and safe to operate for all age groups.

Liniar’s patented roller mechanism is hidden inside each door, maintaining its sleek lines and giving all Liniar doors the most effortless glide action on the market.

Discreet magnets ensure that if the doors are folded back, they remain securely in place.

With our ModLok™ range, only the “master” door will open first, so no chance of spraining locks by opening the wrong door.

Handles and Hinges

Choose from white, black, chrome or gold handles and hinges.

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Personalise your Liniar bi-fold

The Liniar range of bi-folding doors is available in a huge variety of colour options, with additional colours available upon request.

The whole range comes with the Liniar 10-year frame guarantee against fading, cracking or warping.